githubmirror/procps

local/fileutils.c

65 строк1 KB

Roman Žilka

watch: Orderly recovery from cmd taking longer than -n [BUG]; code cleanup

06 окт 2023, 08:34

06 окт 2023, 08:340a5b342

#include <errno.h>
#ifdef HAVE_ERROR_H
# include <error.h>
#endif
#ifdef HAVE_STDIO_EXT_H
# include <stdio_ext.h>
#else
/* FIXME: use a more portable definition of __fpending() (from gnulib?) */
# include <stdio.h>
# define __fpending(fp) ((fp)->_p - (fp)->_bf._base)
#endif
#include <stdlib.h>
#include <unistd.h>

#include "nls.h"
#include "fileutils.h"
#include "c.h"

int close_stream(FILE * stream)
{
	const int some_pending = (__fpending(stream) != 0);
	const int prev_fail = (ferror(stream) != 0);
	const int fclose_fail = (fclose(stream) != 0);
	if (prev_fail || (fclose_fail && (some_pending || errno != EBADF))) {
		if (!fclose_fail && errno != EPIPE)
			errno = 0;
		return EOF;
	}
	return 0;
}

/* Use atexit(); */
void close_stdout(void)
{
	if (close_stream(stdout) != 0 && !(errno == EPIPE)) {
		char const *write_error = _("write error");
		error(0, errno, "%s", write_error);
		_exit(EXIT_FAILURE);
	}

	if (close_stream(stderr) != 0)
		_exit(EXIT_FAILURE);
}

// read a multi-byte character from a byte-oriented stream
wint_t getmb(FILE *f)
{
	unsigned char c2;
	uf8 byte = 0;
	int c;
	wchar_t rval;
	mbstate_t mbstate;

	memset(&mbstate, 0, sizeof(mbstate));

	while ((c = getc(f)) != EOF) {
		c2 = c;
		if (mbrtowc(&rval, (char *)&c2, 1, &mbstate) <= 1)
			return rval;
		if (++byte == MB_CUR_MAX)
			break;
	}

	return WEOF;
}